Plastee-board lath



J. scHuMAcHEH.

PLASTEB BOARD LATH.

Arma/mou man mmm-|919'. Panted July l, 1919.

2 SHEETS-SHEET l.

I. SCHUMACHER.

PLASTEH BOARD 11TH.

APPLICATION FILED MAR. 8.1919, 1,808,724. Patented Ju1y1,-1919. 2EEEEEEEEEEEE 2.

by Mw M ma@ H A bis Azza-cys JOHN scnUMAcHEn, or Los ANGELES, catwoman.y

PLASTEB-BOARD LATH.

To all whom-t may concern.'

Be it known that I, J oHN SCHUMACHER, a1 Y citizen of the United States,residing at Los Angeles, in thel county of Los Angeles andv State ofCalifornia, have invented nevsrr and .y

' useful Improvements in Plaster-Board Lath,

of whichthe following is a specification.

This invention relates to an improved article'of manufacture, and amethod of producing the same. It pertains more particularly to anarticle known as plaster board lath used in buildingconstruction as asubstitute for wire or wooden lath.

It is an object of this invention to prov1de an improved articleofmanufacture consisting of such plaster board or lath which will I besuperior in simplicity of structure, in

durability and length of life..

Lath of the character described is made by in'f'zasing within surfacestrips or sheets of pap per a` plastic composition of suitable plasticmaterial which is initially a moist unstable substance. This plasticmaterial sets, adheres to the sheets, and forms a vhard board.

Such plaster board is often used to produce the finished wall surfacewith suitable decorations applied thereto. In accordance with 'I thepresent invention, the plaster board-1s converted into laths by so'forming it that plaster may be applied thereto .to complete lthe Wallssurface, and the board is so con structed that the applied plaster isgrippedby the plaster board and anchored thereto.

In the manufacture of such plaster board, as ordinarily vcarried on, itis difficult to prevent warping of the product due to unequal shrinkageand expansion of the component parts, and unequal resistance to thestrains produced thereby. In accordance with this invention, the boardis `so constructed as to prevent such warping. Another object of ,thisinvention is to provide a novel and eiiicacious method of making suchboard.

-, The above mentioned objects and other objects as will appear from thedescription, are' susceptible of being ca ried out by means of themechanism illustri ted in the accompanying drawing, in which:

Figure lis a side elevation, partly in sectionV of apparatus suitablefor carrying out the steps of the process; Fi 2 is a plan' view taken onthe line 2 2 of ig. 1 ;.and Fig. 3 is a 'diagrammatic view inperspective of lthe means shown in Figs. 1 and 2 for pro' ducing theboard'. .l

Broadly thefimshed article shown herein specification of Lea s Patent.

' Patentedauly 17, 1919.

Application led March 8, 1919. Serial No. 281,433.

comprises a board having parallel dove tail mortises therein, as bestshown in- Fig. 3. The initially finished board is shown at the right ofFig. 3. The board is made by continuously feedin pliable surface paperand interposing there etween a plastic substance.

During the advance of the paper one sheet thereof is corrugatedtoprovlde thel mortises. The mortises in thelr initial shape, in-

. dicated by a in Fig. 3, have 'parallel side walls which are notundercut. A fullness is, however, providedin 'the corrugated piece sothat upon fiattening the same, av pitch is given to the side walls ofthe mortise to form a dove tail, as indicated by A. This fullness isindicated by a hump b. It is evidentl that the uncorrugated piece C indrying will shrink and place a tension on -that side of the board,'whilethe corrugations on the surface sheet D would permitstretcliing withouttension, and therefore, warping would occur, unless means is provided toprevent the same. lThis I accomplish by inserting adjacent the-surface Da numberl of strips of paper E to act a'stension means while dryingholding the top-layer of the board under` the sametension whiledrying asthe bottom, and thereby 'preventing warping. The surface sheets are fedcontinuously, theupper sheet D passing between a pair of corrugatedrollers'forming .mortises a and lnunps b onthe upper surface between themortises.y The board advances passing beneath a iattening'roller G,which lattens the hump b, thereby forcing over the pitch and forming thedove tails A. v

Referring more particularly to Figs. 1

side Walls of the mortises, givingl them a and 2, a completemachineforcarrying out the process is shown. A plastic composition 'nsvsupply means is indicated generally byI 4.

Mounted thereabove is a plaster mixing means indicated by 5. Papersupply rolls are designated by 6 and 7, and paper strip rolls by 8. Themeans for corrugating the upper surface paper is indicated generally by9, and the flattening roller mechanism by 10. The means for advancingand conveying the plaster board is indicated generally by 11. The carscarrying trays for receiving the initially finished plaster board areindicated by 12.

The plaster composition supply meansy 4.- comprises a hopper 14 mountedu on a suitable frame wor 15- and provi ed with a spout 16, thedischarge from Whichis conrolled by al gate The spout 16 dis? chargesplaster upon the paper supplied .from paper roll-.dat the receiving endof thc advancing means 11. l

^ The plaster mixing means preferably comprises a mixing trough 18 andrevoluble ymixing blades 1 9 fixed to arotatable shaft driven byvsuitable means.

The trough is journaled so that it may be'tilted to discharge thecontents thereof into the hopper,

and a handle 20 is provided on the trough,

whereby the trough may be tilted. A water supply pipe 21 for feedingwater to the mixing trough is controlled by a suitable valve. v

The paper supply roll 6' is journaled upon a Shaft supported by theframe work 22 and preferably below the level of the upper surface of theadvancing means and at the receiving end thereof.

The paper supply roll 7 is similarlyl mounted upon a shaft'supported bya subcorrugating rollers.

frame 23, preferably above the advancing means 11. Both rolls 6-and 7are mounted in accordance with. the usual practicel in mounting largerolls of paper.

The roll of strips of paper 8 is mounted :upon a.. shaft journaled inbrackets secured -to the frame work 1-5.

sa..V

- by 9 in Figs. 1 and 2 and more specifically The corrugating rollsindicated generally .byE andy F in Fig. 3 are disposed below the,roll 8and intermediate rolls 6 and 7. f .A'llhe corrugating rollers arepreferably hollow,l as indicatedin Fig. 3, so that they may be heated to'better press the corrugations into the paper. .These Vrollers aremounted upon shafts journaled -u'pon the frame work 1-5.

Each corriigating roller has a gear secured to one end thereof indicatedby 24A and 25. These gears mesh and positively drive the Means `may beprovided forI adjusting` the distance ofthe lower corrugating rollerabove the upper surface of the advancing means 11, and thereby adjustingthe thickness of the plaster board being produced. e

The advancing means 11 comprises a conveyer belt 2'6` passed overrollers 27 and 28 having shafts journaled upon the ends of the frameworkv 29. A table 30 isformed to properly support the belt.

A motor 32 for driving the machine is belted to a drive wheel 33 mounted0n the which consists in interposiiig and is geared by a, chain 4,3 to asprocket wheel 44 ixedly secured to the shaft carryp ing the uppercorrugating roller F.

It is obvious that all the parts moving the compone-nts of the plasterboard are posifrom the hopper onto the lower sheet of surface paper Cbetween guide boards 45 and 4&6. The conveyer belt carries the strip Cforward and with it the plaster, passing under the lower corrugatingroller. Referring particularly to Fig. 3, the up er surface sheet D incorru ated form is ed forwardly, the plaster ing spread by the lowercorrugating roller. Strips E are fed between the sheets C and'l).Corrugating roller F has teeth of peculiar formation engaging openingsin roller F. The sides of the teeth are parallel, and the tops areprovided with humps B conforming to corresponding depressions in theopenings von roller F. It will be noticed that the sides,

tops-and bottoms of the teeth meet in sharp edges. rIhese 'edges breakthe sheets of paper D as it passes between the rollers for a purposelater described. rlhe plaster board advances from the corrugatingrollers with mortises having parallel 'side walls and the top surface ofthe boards between rollers having humps b. The humps are Hattened by theroller G. Due to the 'break of the paper at the edges or the juncturesof the walls ofthe morti'ses, the side walls of the latter tilt or pitchto form dove tails A. The strips4 of paper E are parallel to thevsurface sheet C and embedded in the plastic material. These stripsprevent distortion of the upper sheet 'D when the humps are beingflattened.

As before stated the plaster board is cut into suitable lengths and isdelivered at the discharge end of lthe conveyei-,upon trays mounted upona car 12, by which it is transported to points where the other, usualsteps in the process of vmaking plaster board are carried out.

` Having thus disclosed myinvention, what l claim and desire to secureby Letters Patentis:

` 1. The process of making plaster board, which consists in interposingbetween sheets of pliable material a plastic substance, one of saidsheets being'corrugated and having a fullness on its surface at theextending said surface by removing said fullness, whereby the sides ofsaid grooves are pitched.

2. The process of making laster board, Ween sheets of pliable material aplastic substance one of said sheets being cori-uga and having aiisooves; and

fullness in its outer surface between the Grooves; and extending saidouter surface I y removing said fullness, whereby the sides of saidgrooves are pitched.

3. The process of making plaster board, which consists in inter-posingbetween sheets of pliable material a plastic substance, one of saidsheets being corrugated and having undulations in its outer surfacebetween grooves; and flattening said undulations, whereby the sides ofsaid grooves are pitched.

. 4. The process of making plaster board, which consists of formingmortises having broken edges in a. sheet of pliable material, said sheethaving a fullness in its surface at the grooves; interposing betweensaid sheet and another sheet plastlc material; and extending saidsurface by removing said fullness, whereby the sides of said grooves arepitched.

5. The process of making plaster board, which consists in forminmortises having broken edges in a sheet o pliable material, said sheethaving a fullness in its outer surface between corrugations; interposingbetween said sheet-and another sheet of pliable materi'al a plasticsubstance; and ex-.

tending said outersurface by removing said fullness, whereby the 'sidesof said grooves are pitched.

6. The process of making plaster board, which consists in formingmortises havin broken edges in a sheet of pliable materia said sheethaving undulations in its outer surface between mortises; interposingbetween said sheet and another sheet of pliable material a plasticsubstance; and flat- 4tening said undulations, whereby the sides of saidgrooves are pitched.

7. The process of making plaster board,

which consists in interposing between a flat sheet of pliable materialand a corrugated sheet of pliable material a plastic substance;intel-posing between said sheets and adjacent said corrugated sheettension strips of shrinking characteristics like said fiat sheet toprevent warping of said board.

8. The process of making plaster board, which consists in interposingbetween a flat sheet of pliable material and a corrugated sheet ofpliable material a plastic substance; and interposing between saidsheets and adjacent said corrugated sheet tension strips of the samematerlal as said flat sheet to preventwarping of said board.

9. The process of making plaster board, which consists in interposingbetween a flat sheet of pliable material and 'a corrugated sheet ofpliable material a plastic substance, said corrugated sheet having afullness in `its outer surface between the grooves; interposing betweensaid sheets and adjacent said corrugated sheet tension strips ofshrinking characteristics like said flat sheet; and eX- tending saidsurface by removing said fullness, whereby the sides of said grooves arepitched.

10. The process of making plaster board,

. which conslsts of interposing between a fiat sheet of pliable mater1aland a corrugated sheet of pliable material a plastic substance,

said corrugated sheet having undul-a-tions therein; interposing betweensaid sheets and adjacent said corrugated sheet tension strips ofshrinkin characteristics like said flat sheet; and liatten saidundulations, whereby the sides of said groove are pitched.

In witness that I claim the foregoing I have hereunto subscribed my namethis 26th day of February, y1919. i

' JOHN SCHUMACHER.

